Unit 12 - Area Flashcards

1
Q

What is the area of a parallelogram? (2)

A
  1. A = bh
  2. A = ab ⋅ sinc
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2
Q

What is the area of a triangle? (4)

A
  1. A = bh/2
  2. √s (s - a) (s - b) (s - c)
  3. (s/2)² √3
  4. (1/2) ab ⋅ sinc
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3
Q

What is the area of a trapezoid?

A

1/2 (b1 + b2) x h

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4
Q

What is the area of a rhombus/kite?

A

(diagonal 1 x diagonal 2) /2

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4
Q

What is Heron’s Formula? (3)

A
  1. Must be given all 3 side lengths
  2. Find Semi - Perimeter (Perimeter/2)
  3. √s (s - a) (s - b) (s - c)
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5
Q

What is the formula for finding the area of an equilateral triangle when given 1 side length?

A

A = (s/2)² √3

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6
Q

What is the formula for finding the area of a hexagon?

A

A = 6 (s/2)² √3

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7
Q

When do you know when to use (1/2) ab ⋅ sinc?

A

SAS

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8
Q

What is the equation for finding the area of a sector?

A

Area of Sector/πr2 = Measure of Central Angle/360

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9
Q

Definition of Apothem (3)

A
  1. Line segment
  2. Connects center of circle
  3. Perpendicular to a side of a polygon
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10
Q

Definition of Central Angle

A

Angle between two radii

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11
Q

What is the formula for percent error?

A

(|Measured - Actual|/Actual) x 100

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12
Q

What are the guidelines to classify figures as cylinders? (3)

A
  1. Planes are Parallel
  2. Planes are the Same Shape
  3. Planes are Connected with Infinite Amount of Segments
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13
Q

Definition of Oblique

A

Lateral edges are NOT perpendicular to the base

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14
Q

Definition of Circular Cylinder

A

Planes are Circles

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15
Q

Definition of Prism

A

Cylinders with a Polygonal Base

16
Q

What’s the relationship between cylinders and prisms?

A

All prisms are cylinders, but not all cylinders are prisms

17
Q

What are the rules when naming cylinders? (3)

A
  1. Determine if Prism or Cylinder
  2. Determine if Oblique or Right
  3. Determine Shape of Plane (Based on # of Sides)
18
Q

What is something to keep in mind when identifying the solid created through the rotation of 2D Shapes?

A

Circles will ALWAYS be involved

19
Q

Definition of Cross Section

A

2D Shape created Plane Slices through Solid

20
Q

Definition of Lateral Area

A

Sum of areas of the lateral faces of a cylinder.

21
Q

Definition of Surface Area

A
  1. 2D measurement
  2. Sum of all areas of all faces (lateral and bases)
    (LA + 2B)
22
Q

What is the Lateral Area of a Right Circular Cylinder?

A

LA = 2πrh
___________________________________
1. LA is just a rectangle
2. LA = lw
3. Length will be Height & Width will be Circumference

23
Q

What is the SA of a Right Circular Cylinder?

A
  1. Lateral Area + 2 Area of Bases
  2. 2πrh + 2 (πr²)
24
Q

What is the SA of Rectangular Prism?

A

2lw + 2lh + 2wh
(Little WIlly Lost His White Hat)

25
Q

How do you find the LA of a Triangular Prism?

A

LA = h (perimeter of base)